Variable-speed frictional drive mechanism.



W. BARTHOLOMEW. VARIABLE SPEED PRIGTIONAL DRIVE MECHANISM.

APPLICATION IILBD MAY 15, 1911.. v 1 ,108,672. Patented Aug. 25, 1914 4SHEETSSHBET 1.

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W. B ARTHOLOMEW.

VARIABLE SPEED FRIGTIONAL-DRIVE MECHANISM. APPLICATION FILED MAY 15,1911.

v 1,108,672. Patented Aug.25,1914.

4 SHBETSSHEET 2.

@- illllllllnllll WITNESSES INVENTOR W. BARTHOLOMEW. VARIABLE SPEEDFRIGTIONAL DRIVE MECHANISM. APPLICATION FILED MAY 15, 19,11. 1 1 08,672.

Patented Aug. .25, 1914 WITNESSES W. BARTHOLOMEW.

VARIABLE SPEED FRIGTIONAL DRIVE MECHANISM.

APPLICATION FILED M-AY15, 1911. 1 1 08,672. Patented Aug. 25, 1914 4SHEETSSHEBT 4.

WITNESSES INV NTOR WiZZz'amBarZ/zalamaw A [farm THE NORRIS PETEIS CO..PHDTO-LITHO.. WASHINGTON, D, c

UNITED STATES PATENT curios.

WILLIAM BARTHOLOMEW, OF CHICAGO, ILLINOIS, ASSIGNOB TO TROY LAUNDRYMACHINERY COMPANY, LIMITED, OF CHICAGO, ILLINQIS, A CORFORATIQN OF NEWYQRK.

To all whom it may concern: 1

Be it known that 1, WILLIAM BARTrio Lo- MEW, a citizen of the UnitedStates, residing at Chicago, county of Cook, State of Illinois, haveinvented certain new and useful Improvements in Variable-SpeedFrictional Drive Mechanism, of which the following is a specification,reference being had therein to the accompanying drawing.

This invention relates to variable speed frictional drive mechanismespecially constructed to be used in connection with ironing machines ofall characters which are driven by electric motors, the object being toprovide driving mechanism which is so constructed that the speed of theironing machine may be quickly changed by the operator. i I

Another object of the invention-is to provide a frictional drive inwhich the drlven member is adjustably mounted in respect to the drivingmember, the controlling mechanism of said members being so connectedthat it'will be impossible to move the driven member in respect to thedriving member without first shifting the driving member,

whereby all danger of stripping the fric-- tional surface of theperiphery of the drivenmemberis prevented.

- A further object of the invention is to provide a driving mechanismwhich is so constructed that the shifting of the mechanism to change itsspeed will be gradual,

,the driving member being held in engagement with the driven member by aspring.

A still further object of the invention is to provide a drivingmechanism which is exceedingly simple in construction, the parts beingso arranged and connected that alldanger of the mechanism becoming outof order when in operation is prevented.

Another object is to provide a treadle mechanism for shifting thedriving memher which engages and locks the lever for shifting the drivenmember whereby it will be impossible for the operator to change thespeed of the drivin mechanism without first operating the treadle tothrow the driving member out of engagement with the driven member.

Other and further objects and advantages of the invention will behereinafter set forth'and the novel features thereof defined by theappended claims.

In the drawingsFigure 1 is a side eleva- Specification of LettersPatent.

Application filed May 15, 1911.

VARIABLE-SPEED FRICTIONAL DRIVE MECHANISM.

Patented All. 25, 1914.

Serial No. 627,269. 7 l 1 tion of my improved driving mechanism showingits application to a six roll fiat work ironer; Fig. 2 is a top planview of the driving mechanism; Fig. 3 is a detail longitudinal verticalsection through a portion of the driving mechanism Fig. 41 is an endelevation of theshifting mechanism for changing the speed Fig. 5 is asection taken .on' line 5+5 o'f'Fig. 4:; Fig. 6 is an end'elevation ofthe shifting lever and treadle mechanism; and Fig. 7 is a detailvertical section showing the manner of mounting the treadle.

Like numerals of reference refer to like parts in'the several figures ofthe-drawings. In the drawings, 1 indicates a portion of a six roll fiatwork ironing machine which is provided with the usual master gear,herein shown incased. Extending outwardly from the side of the frame ofthe ironing machine isan auxiliary frame-2 on which is mounted anelectricpmotor 3having a drive shaft 1-. connected to the driving shaft5 of the mechanism by a coupling 6 which allows the driving shaft 5 tohave a longitudinal movement within the coupling as clearly shown. Theshaft 5 is mounted in suitable bearings v7 formed on the upper ends ofstandards 8 ofthe frame 2, said. standards having formed integraltherewith a frame 9. The frame 9 terminates in outwardly proecting armshaving bearings 10 in which is journaled a drivenshaft 11 which isprovidedwith frictional disks 12 and 13 adapted to be engaged by africtional driving disk 14 fixed on the end of the shaft 5. vThe disk 12is loosely mounted on the shaft 11 and the disk 13 is keyed thereon soas to move longitudinally in order to shift its position in respect tothe center of the driving disk 14 whereby the speedof thedriven shaft 11can be changed. The driven shaft 11 carries a pinion 15 which mesheswith an intermediate gear 16 which, in turn, meshes with the master gearof the ironing machine whereby the ironing machine will be driven insuch a manner that the speed of thesame may be varied. 1

For moving the driven disk '13 upon the driven shaft 11, I provide thedisk with an annularly grooved hub 17 in which the yoked end 18 of anarm 19 is loosely mounted, said arm havin an integral sleeve por tion 20which is s idably mounted upon a guide rod 21 carried by depending arms22 of the bearings 10. Pivotally connected to the sleeve is a'link 23,the free end of which is mounted in the bifurcated end 24: of a crankarm 25 fixed on the end of a rock shaft 26 mounted in suitable Supports27'.

it will be seen that by rocking the shaft 26, the sleeve 20 will bemoved upon the guide rod 21 in such a manner that the driven disk willbe shifted on the driven shaft in order with a bifurcated lower end '33in which is pivotally mounted a link 3:4. to which is connect-ed acoupling 35 carriedby the end of a cable 36Wl1i0l1 passes over guidepulleys 37v and has a coupling 38 at its other end'which is connected toa link 39 mounted in the bifurcated end 40 of the vertical arm 41 of atreadle 42 which is providedwith a foot piece 43. By this construction,the driving disk 14L may be moved out of engagement with the driven diskandthe idle disk.

For normally holding the driving disk in engagement with the driven dishand idle disk, I provide a coiled spring 44: which surrounds the shaft 5and engages the collar 28 at one end and adjusting nuts 45 at its otherend carried by a sleeve46 mounted upon the shaft 5which is provided witha collar 4;? adapted to engage thrust bearings AiScarried by the bearing7 and it will be seen that by this construction, the tension of thespring 44 may be adjusted in order to regulate the pressure of thedrivingdisk against the driven disk and idle disk.

Fixed on the end of the rock shaft 26 is a lever 49 for rocking theshaft, said lever having a spring actuated detent 50 engaging asegmental rack 51 for locking the same in its adjusted. position inorder to change the speed of the ironing machine. The rock shaft 26carries a segmental rack 52 which is engagedby a lug 53 of the treadlea2 in such a manner that the rock shaft is locked whenthe treadle is inits normal position, thereby preventing the swinging of the rock shaftto change the speed untilthe treadle has been depressed to move thedriving disk out of engagement with the driven disk; It will be seenthat by this construction, it is impossible to change the speed; of themachine without first operating the treadle, whereby all danger ofstripping the frictional engaging surface of the driven member isprevented. I I v j Having described my invention and set forth itsmerits what I claim and desire to secure by Letters Patent is:

1. In a driving mechanism, the combination with a movable driven member,of a driving member mounted to engage said driven member, a rock shaft,a connection between said rock shaft and'driven member,

a lever for rocking said shaft, a segment said treadle in the path oftravl ofsaid segment.

2-. In a driving mechanism,the combination with driving and drivenmembers mounted to move at right angles to each other, of a rock shaftfor moving said driven member, a pivoted lever for moving said drivingmember, in one direction, a spring. for moving said driving member in' are verse'direction,-a treadle for shifting said lever, a segmental rackcarried by said rock shaft, and a'lug arranged on said treadlein thepath of travel of said segmental rack.-

3. In a driving mechanism, the combination with a driven member and adriving member mounted to move at right angles to each other, of aspring for holdingsaid driving member in contact with thedriven mem- Yber, a treadle-control for said driving member, a rock shaft-control forsaid driven member, a segment on said roclrshaft, anda lug extendingfrom said treadle in the path of travelof said segment.

.4. In adriving mechanism for ironing machines, the combination with adriving shaft, of a driven shaft, adriving member fixed on said drivingshaft, a driven member feathered upon said driven, shaft, a spring forforcing said driving shaft in one'direction, a treadle mechanism'formoving said shaft in a reversedirectioma rock shaft for shiftingsaiddriven member upon .said driven shaft, a segment upon said rockshaft,and a lug upon said treadle arrangedin the path. of travel ofjsaidsegment. v

5. In a driving .mechanism for --ironing machines, the combination withacontinuously rotating motor, of a driving shaft hav-' ing aslidingconneotion-with said motor, adriving member fixed upon saiddriving shaft, a spring surrounding said driving shaft for movingsaidshaft in one direction, a lever having a circular portionsurrounding said driving shaft and having a connection therewith, acable for operating said lever, a treadle for operating said cable, .adriven member cooperating with said 'driving member, a rock shaft foroperating said driven member, a segment upon said rock shaft, and a lugupon said treadle arranged in the pathof travel of said segment. i

6. In a driving mechanism, the combination with a driven member, of arock shaft. having a connection with said drivenmem-v ber, a segmentalrack fixed on said rock shaft, adriving member, a spring for holdingsaid driving member in contact with said driven'member, a treadle forshifting said driving member, and a lug projecting v from said treadlearranged in the path of travel of said segmental rack for locking saidrock shaft.

7. In a driving mechanism, the combination with a driven member, adriving shaft, a driving membercarried by said driving shaft forengaging the driven member, a bearing for said shaft, a collar fixed onsaid shaft, a coiled spring surrounding said shaft engaging said collar,a sleeve loosely mounted on said shaft carrying adjusting nuts engagingsaid spring, athrust bearing carried by the first mentioned bearing, anda collar carried by said sleeve engaging'said bearing.

In testimony whereof I affix my signature in presence of two Witnesses.

WILLIAM BARTHOLOMEW.

Witnesses:

J. W. GRIFFEN, J. HOERMANN.

Copies of this patent may be obtained for five cents Washington,

each, by addressing the Commissioner of Patents,

